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A multigraph is a sequence of letters that behaves as a unit and is not the sum of its parts, such as English or French . The term is infrequently used, as the number of letters is usually specified: *Digraph (two letters, as or ) *Trigraph (three letters, as or ) *Tetragraph (four letters, as German ) *Pentagraph (five letters) *Hexagraph (six letters) *Heptagraph (seven letters) Combinations longer than tetragraphs are unusual. The German pentagraph has largely been replaced by , remaining only in proper names such as or . Except for doubled trigraphs like German , hexagraphs are found only in Irish vowels, where the outside letters indicate whether the neighboring consonant is "broad" or "slender". However, these sequences are not predictable. The hexagraph , for example, where the and mark the consonants as broad, represents the same sound (approximately the vowel in English ''write'') as the trigraph , and with the same effect on neighboring consonants. The seven-letter German sequence , used to transliterate Russian , as in for "borscht", is a sequence of a trigraph and a tetragraph rather than a heptagraph. Likewise, the Juu languages have been claimed to have a heptagraph , but this is also a sequence, of and . Beyond the Latin alphabet, Morse code uses hexagraphs for several punctuation marks, and the dollar sign is a heptagraph, . Longer sequences are considered ligatures, and are transcribed as such in the Latin alphabet. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Multigraph (orthography)」の詳細全文を読む スポンサード リンク
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